Which statement is characteristic of reproduction in humans? 1)The reproductive cells of males and females differ in chromosome number. 2) Males and females produce gametes in the ovaries. 3)Males and females produce the same number of gametes. 4) The reproductive cycles of males and females are regulated by hormones.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.